Hazardous smog blanketing China's north-east sparks more red alerts, with authorities advising residents in 10 cities to stay indoors.
Beijing authorities have issued a second pollution "red alert", little more than a week after its first ever such warning.
Schools in the Chinese capital Beijing are ordered to keep children indoors amid extremely high levels of air pollution.
Hazardous smog blanketing China's north-east sparks more red alerts, with authorities advising residents in 10 cities to stay indoors.
Beijing authorities have issued a second pollution "red alert", little more than a week after its first ever such warning.
Schools in the Chinese capital Beijing are ordered to keep children indoors amid extremely high levels of air pollution.
